Strength training sets and reps

When I started strength training six months ago, I met with a personal trainer to get a plan of attack and to learn how to use the equipment. He had me start with 3 sets of 15-20 reps for 8 weeks to build endurance, then 3-4 sets of 12-15 reps for 8 weeks to build muscle mass, and finally 4 sets of 8-12 reps for 8 weeks to build strength.

I'm nearing the end of my final 8 weeks, and I have no idea if I should start the cycle over or keep going with what I'm doing. I could always meet with the trainer again, but they have limited training hours at my gym, so meeting with the trainer means taking a half day off work. Any suggestions will be appreciated!

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